anyone use the common on thier perko switch to wire in a sub? ballast pump? My perko switch is under my dash, and has a power wire from somewhere connected to the common. I guess the wire only powers up when either battery is on, so can I do the same for a amp? or ballast pump? Let me know soon, I really dont want to buy the extra long wire to run back to my batteries. <BR> <BR>thanks, <BR>Mike